This one was mine, a 1998 Mercedes W208. The nice things about it were the cool Mono-Wiper, the engine (supercharged 2,3L M111) and the seats that were perfect for my height. It had a terrible ASR system but came with a LSD, so it was lots of fun in the winter.
The not-so-nice things about it were that the ignition randomly would not recognize the key, a missing catalytic converter, two fist sized rust holes in the front control arms, rust all over the underbody and the absolute worst 6-speed manual transmission I have ever used.
It also had multiple alignments but it didn't take long for the steering-wheel to be off-center again. You could see the tail end "crabbing" in the rear view mirror. There was something very wrong with it, which can probably be attributed to one of the 7 previous owners.
This isn't even counting all minor annoyances like the frameless windows not lowering themselves when you open the doors (that was only a thing after the 1999 model year), the wind noise, the awful interior materials, the broken seat latch in the rear, the trunk lock not working... I could go on for an hour like this.
So anyways, what is the worst car YOU have ever owned?
I haven't really had a "bad" car yet. My oldest car was my first, a 2003 Ford Taurus. Wearables needed to be replaced but outside of that, the only thing I can say that would make it the "worst car" is that the cruise control lever broke and got stuck while I was driving it, so essentially my throttle was stuck open while I was going about 70 MPH. I tried not to panic, and shifted into neutral (it was also an automatic) so I could shut the car off and then coast to safety.
Doesn't cruise control deactivate when you press the brake?
It would, yes, if the physical mechanism for controlling wasn't stuck. After I pulled over I looked in the engine bay and noticed that the plastic bit that was mounting it snapped and the wire was stuck.
That sounds scary AF. Props to you for maintaining presence of mind and avoiding a catastrophic accident. I heard similar runaway vehicle stories from Ford owners when electronic throttle bodies were first introduced.